在工作时间和工作场所内，因（）受到事故伤害的；可以认定魏工伤
A. 私人原因
B. 单位原因
C. 个人原因
D. 工作原因
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[音频]Long Conversation
A. He is the only boy in his family
B. He becomes tearful in wind
C. He has stoppedmaking terrible faces
D. He is his teacher's favorite student
[音频]Passage
A. Everything seemed to be changing.
B. People were formal and disciplined.
C. People were excited to go travelling overseas.
D. Things from the Victorian era came back alive.
文件系统的主要目的是（ ）。
A. 实现对文件的按名存取
B. 实现虚拟存储
C. 提高文件的读写速度
D. 保护用户文件不丢失
（ ）是文件系统中最大的数据单位，它描述了一个对象集。
A. 数据项
B. 关键字
C. 记录
D. 文件
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